diff --git a/diagonalZhop.html b/diagonalZhop.html new file mode 100644 index 0000000..1c7efa9 --- /dev/null +++ b/diagonalZhop.html @@ -0,0 +1,95 @@ + + + + + + + + +
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Aim:
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To provide a compromise between no Z hop, which reduces stringing but has a higher chance of the nozzle knocking the model loose, and Z hop, which does the opposite.

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When required:
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This is currently experimental, and may not be needed in many cases. If you have a print that keeps disloging from nozzle contact, this may be worth a try.

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Tools:
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Your own sliced gcode and the post processor on on this page.

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This page allows you to paste in your existing sliced gcode and have it convert it to diagonal Z hop. It is a simple conversion and has been tested thoroughly, but still use it with caution.

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This concept is covered in detail in the following video:

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Diagonal Z hop is an experiment

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This is the result of a 'what if' thought when printing a tricky model. It may turn out to be useful, useless, or perhaps need alteration to be more effective. The post processing script on this page has limitations that actual slicing software does not. Proper implementation in a slicer might be more effective. Please try it out and post your feedback in the comments of the video above.

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If this concept does have merit, I am very happy for it to be implemented into any and every slicer that wants it. If the process helps people, I gladly release it to the public domain.

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Traditional retraction, travel and Z hop

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Retraction is when filament is pulled away from the hot end to reduce pressure. This will usually be done before a travel move. A travel move is a movement made by the printer where no filament is extruded. At the end of the travel move, the extruder will usually unretract to get nozzle pressure back to normal, and then continue printing. Without retraction, prints tend to suffer from stringing, where filament leaks during travel moves and creates fine strings of filament connecting surfaces that should be isolated:

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Z hop is an option your slicer can employ either side of a travel move. After retraction, the nozzle will lift up vertically, followed by the travel move, then move vertically downwards to return to the correct height, before unretracting and resuming printing.

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Z hop gives the nozzle additional clearance over the model, which can prevent the nozzle from crashing into the model and knocking it loose. This can ensure success on a tricky model where parts with steep overhangs may curl up on the tip into the path of the nozzle. However, Z hop is compromised because it generally introduces fine stringing. It improves reliability at the expense of print quality.

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Aim of diagonal Z hop

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Rather than have Z hop be a three part movement (up, travel horizontally then down), diagonal Z hop breaks a travel move into two sections.

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It is hoped that the sequence is faster than standard Z hop, reduces stringing, whilst still offering additional clearance over delicate models to prevent collisions.

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The following diagrams best illustrate the movment path for each of these options:

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Diagonal Z hop Post Processor
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The following form will convert your existing gcode to have diagonal Z hop. Slice a model of your choice in your own slicer with the following considerations:

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  • Traditional retraction as opposed to firmware retraction.
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  • Z hop should be turned OFF. Slice with a normal travel move only.
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  • Absolute movements G90 vs relative movements G91. This is the default for most slicers.
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Firmware and slicer flavour should not matter. As long as the slicer outputs G0/G1 commands for movements, this post processor should work.

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Please consider that like using standard Z hop, your Z axis will be a lot more active during printing. If you already experience any problems with binding, any form of Z hop will make it worse.

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Existing gcode

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You may attach a file and have this page automatically extract its contents to the input box, or paste the gcode into the input box yourself.

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Or paste your existing gcode into the box below:

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Parameters

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Version: + + + + +

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Output gcode

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.gcode

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Warning - Read carefully!

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Every attempt has been made to ensure this is safe but ultimately there always is risk in running modified gcode from the internet. Preview the gcode in your slicer or Zupfe GCode Viewer and print at your own risk.

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Only print this gcode when you are present, alert and capable of stopping the printer in case of emergency.

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Validation has been built into the forms to only allow sensible min and max values, however this is not foolproof.

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+ + + + + \ No newline at end of file diff --git a/img/dhz-comparison-banner.jpg b/img/dhz-comparison-banner.jpg new file mode 100644 index 0000000..4d4c50a Binary files /dev/null and b/img/dhz-comparison-banner.jpg differ diff --git a/img/dzh-selection-banner.jpg b/img/dzh-selection-banner.jpg new file mode 100644 index 0000000..8a57d14 Binary files /dev/null and b/img/dzh-selection-banner.jpg differ diff --git a/js/dynamic.js b/js/dynamic.js index b696f1e..121c8af 100644 --- a/js/dynamic.js +++ b/js/dynamic.js @@ -1,5 +1,5 @@ -var pages = ["Home", "Calibration", "Troubleshooting", "Upgrade Guides", "Review Policy", "Sponsors", "Contact"] -var urls = ["index.html", "calibration.html", "troubleshooting.html", "upgrades.html", "reviewpolicy.html", "sponsors.html", "contact.html"] +var pages = ["Home", "Calibration", "Troubleshooting", "Upgrade Guides", "Diagonal Z Hop", "Review Policy", "Sponsors", "Contact"] +var urls = ["index.html", "calibration.html", "troubleshooting.html", "upgrades.html", "diagonalZhop.html", "reviewpolicy.html", "sponsors.html", "contact.html"] var menu = ''; var tab; for(var i = 0; i < pages.length; i++){ @@ -26,7 +26,6 @@ $( "#up" ).bind( "click", function() { $('html, body').animate({scrollTop: '0px'}, 500); }); - var footer = `

This page is fully open source. If you find a bug or have a feature request, please post in the issues section. Make sure to read the pinned readme.

This page was created using:

diff --git a/js/gcodeprocessing.js b/js/gcodeprocessing.js index ffd38b0..c5624e8 100644 --- a/js/gcodeprocessing.js +++ b/js/gcodeprocessing.js @@ -709,6 +709,117 @@ function processGcode(formName) { downloadFile(description+'.gcode', gcode); } +function convertGcode() { + var file = document.getElementById("uploadedFile").files[0]; + console.log("1"); + if(file) { // A file has been atached with the file input + if(file.name.search(".gcode") == -1){ + console.log("2a: Non .gcode file."); + alert("Please select a gcode file only"); + return; + } + var reader = new FileReader(); + reader.readAsText(file, "UTF-8"); + reader.onload = function (evt) { + console.log("2b: Converting uploaded file."); + document.diagZhop.tradGcode.value = evt.target.result; // set gcode variables to file contents + console.log("3"); + } + reader.onerror = function (evt) { + alert("Error reading file"); // warn user if file not suitable + console.log("2c: Error reading file."); + } + } else { + console.log("2d: Nothing to convert"); + alert("No file attached."); + } +} + +function copyToClipboard(div) { + var copyText = document.getElementById(div); + copyText.select(); + copyText.setSelectionRange(0, 99999); // For mobile devices + navigator.clipboard.writeText(copyText.value); +} + +function diagonalZhop() { + document.diagZhop.diagZhopGcode.value = ""; + var hop = parseFloat(document.diagZhop.diagZheight.value); // Collect user specific vertical height + var minLength = parseFloat(document.diagZhop.minLength.value) // Collect user specified minimum travel length + var version = document.diagZhop.version.value; // Collect user specified version input + var oldX, oldY, nextX, nextY, halfX, halfY, oldZ, halfZ, oldF, travelLength, startedExtrusion, gType; + var regexpX = /X-?[0-9\.]+/; // Regex to search for X coordinates + var regexpY = /Y-?[0-9\.]+/; // Regex to search for Y coordinates + var regexpZ = /Z-?[0-9\.]+/; // Regex to search for Z coordinates + var regexpF = /F[0-9\.]+/;// Regex to search for F feedrate + var gcode = document.diagZhop.tradGcode.value; // Collect user input gcode + if(gcode == ""){ // No file attached or input into text field + alert("Please enter gcode into the text box."); + return; + } + var gcodeArray = gcode.split(/\n/g); // Split gcode line by line into an array + gcodeArray.forEach(function(index, item){ // For each line.. + if((gcodeArray[item].search("G0") == 0) || (gcodeArray[item].search("G1") == 0)){ // Check if G0/G1 present + if(gcodeArray[item].search(/Z/) > -1){ // Search for change of Z height / layer change + oldZ = parseFloat(gcodeArray[item].match(regexpZ)[0].substring(1)); // Store current Z height + } else if((gcodeArray[item].search("X") > -1) && (gcodeArray[item].search("Y") > -1)){ // Both X and Y positions present - travel or print move + if(gcodeArray[item].search("E") > -1){ // Search for E = extrusion move + startedExtrusion = true; // Mark that actual printing has started + oldX = parseFloat(gcodeArray[item].match(regexpX)[0].substring(1)); // Store current X position + oldY = parseFloat(gcodeArray[item].match(regexpY)[0].substring(1)); // Store current Y position + } else { // No extrusion - travel move + if(startedExtrusion){ // Only progress if printing has actually started + gType = gcodeArray[item].substring(0,2); // Capture either 'G0' or 'G1' to reuse + nextX = parseFloat(gcodeArray[item].match(regexpX)[0].substring(1)); // Store X coordinate for end of travel move + nextY = parseFloat(gcodeArray[item].match(regexpY)[0].substring(1)); // Store Y coordinate for end of travel move + travelLength = parseFloat(Math.sqrt(Math.pow(nextX-oldX, 2) + Math.pow(nextY-oldY, 2))); // Calculate length of travel move using Pythagoras' theorem + if(travelLength > minLength){ // Check if travel meets length requirement, create diagonal Z hop if it does + if(gcodeArray[item].search("F") > -1){ // Store feedrate for travel move if it is present + oldF = parseFloat(gcodeArray[item].match(regexpF)[0].substring(1)).toFixed(4); + } else { + oldF = -1; // If no F parameter, mark as -1 + } + if(version == "trad"){ + halfX = (oldX + nextX) / 2; // Calculate half way point for X travel + halfY = (oldY + nextY) / 2; // Calculate half way point for Y travel + } + oldX = parseFloat(gcodeArray[item].match(regexpX)[0].substring(1)); // Store X position in case of multiple travel moves in a row + oldY = parseFloat(gcodeArray[item].match(regexpY)[0].substring(1)); // Store Y position in case of multiple travel moves in a row + halfZ = parseFloat(oldZ + hop).toFixed(4); // Calculate temporary z height for peak of diagonal travel + if(version == "trad"){ // Create movements for a diagonal Z hop halfway between points + var newLine = gType+" X"+parseFloat(halfX).toFixed(4)+" Y"+parseFloat(halfY).toFixed(4)+" Z"+halfZ; // Create new G0/G1 travel move to the halfway point + if(oldF != -1){ // Check if a feedrate was stored or bogus -1 value + newLine += " F"+oldF; // Add F feedrate to the line if possible + } + newLine += " ; Diagonal Z hop part 1\n"; // Add comment + gcodeArray[item] = newLine+gcodeArray[item]+" Z"+oldZ+" ; Diagonal Z hop part 2"; // Add new travel move plus old travel together, adding Z height to the end of the old travel move. + } else { // Create movements for a diagonal Z hop above the destination, then lower down + gcodeArray[item] += " Z"+halfZ+" ; Diagonal Z hop part 1\n"; + gcodeArray[item] += gType+" Z"+oldZ+" ; Diagonal Z hop part 2"; + } + } else { // If the travel length was too short, add comment only + gcodeArray[item] += " ; Travel move of "+travelLength+" below user threshold of "+minLength+" mm"; + } + + } + } + } + } + }); + gcode = gcodeArray.join("\n"); // Join all of the individuallines back together + var header = "; Experimental diagonal Z hop post processor from: https://teachingtechyt.github.io/diagonalZhop.html\n"; // Add URL + header += "; Diagonal Z hop height: "+hop+" mm\n"; // Add user input + header += "; Miniumum travel length: "+minLength+" mm\n" // Add user input + header += "; Version: "; // Add user input + if(version == "trad"){ + header += "Traditional (diagonal move up to half way point)\n"; + } else { + header += "Alternate (diagonal move to above finishing point)\n"; + } + gcode = header+gcode; // Append string to the start of the start of the gcode + document.diagZhop.diagZhopGcode.value = gcode; // Insert post processed gcode into the output box +} + function outputSettings(formName) { var fileName; var string = "Settings for ";