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--- projects:3dprint:troubleshooting [2023/10/20 07:50] – removed - external edit (Unknown date) 127.0.0.1
+++ projects:3dprint:troubleshooting [2023/10/20 18:04] (current) – [Print speed] jattie
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+====== PETG blobs and PETG stringing ======
+Even though the issues of PETG blobs and PETG stringing look different from the outside, they are caused by the shared problem of over-extrusion. So, if you solve the over-extrusion problem, you would be preventing both blobs and stringing from troubling you again.
+As PETG blobs and PETG stringing are often related to the settings of your 3D printer, configuring your printer with the correct values will prevent these issues from happening again. ((https://www.3dprintbeast.com/how-to-prevent-petg-blobs-and-stringing/)) ((https://all3dp.com/2/petg-print-settings-how-to-find-the-best-settings-for-petg/)) ((https://www.wevolver.com/article/petg-print-settings-adjusting-temperature-speed-retraction-to-improve-printing))
+Optimizing these settings can be challenging due to both the knowledge and the amount of trial and error needed to get right.
+===== Printer Settings =====
+  * Retraction speed
+  * Retraction distance
+  * Retraction minimum travel
+  * Travel speed
+  * Nozzle temperature
+  * Print speed
+===== Experimental Features =====
+  * Coasting
+  * Wiping
+  * Combing
+  * Z-hop
+^Parameter^Start^Increment^
+^Retraction distance|6mm|1mm|
+^Retraction distance sprite|0.6mm|0.1mm|
+^Retraction speed|25mm/s|5mm/s|
+^Retraction speed sprite|85mm/s|5mm/s|
+^Retraction minimum travel|5mm|5mm|
+^Travel speed|2 x print|5-10mm/s|
+^Nozzle temperature|220-255|5|
+^Print speed|60mm/s|5-10mm/s|
+^Coasting|nozzle dia cubed/0.064mm cubed|0.01mm cubed|
+^Wipe distance|1.2mm|0.01mm|
+^Combing|disabled|enabled|
+^Z-hop|enable/0.2mm|0.1mm|
+===== Retraction speed =====
+To correct the retraction speed setting, you can start by increasing the retraction speed by increments of 5 millimeters/second. If adjusting the retraction speed made the situation better, you can use smaller increments for fine-tuning. For a sprite extruder start with 0.6mm and 85mm/s ((https://www.crealityexperts.com/creality-sprite-extruder-pro-upgrade-kit-install-guide#:~:text=In%20your%20slicer%20software%2C%20be,and%2085%20mm%2Fs%20speed.))
+===== Retraction distance =====
+To correct the retraction distance setting, start increasing retraction distance by increments of 1 millimeter. Just as you have done with the retraction speed setting, you can fine-tune with smaller increments after seeing improvements.
+===== Retraction minimum travel =====
+To correct the retraction minimum travel setting, start increasing the retraction minimum travel value by increments of 5 millimeters.
+Set the retraction minimum travel setting to the highest possible value where you don’t experience blobs and stringing to lower the risk of filament grinding.
+===== Travel speed =====
+To correct the travel speed((https://www.wevolver.com/article/tips-to-improve-petg-bed-adhesion)) setting, increase the travel speed value by increments of 5-10 millimeters/second until you find a balanced value where you don’t experience any blobs, stringing, or ghosting.
+Travel moves should be as fast as possible, at least 120 mm/s, to avoid oozing.
+===== Nozzle temperature =====
+PETG will typically print at temperatures between 220 and 255 °C. Start with a temperature as low as 220 °C and do some test prints. If you hear a knocking noise during printing, your extruder is skipping, and you should increase the nozzle temperature by 5 °C. Repeat the test until the extruder doesn’t skip.
+Prusa suggests a printing temperature of 230 °C for the first layer and a slightly higher temperature of 240 °C for the rest of the build.((https://help.prusa3d.com/en/article/petg_2059)) Filament company MatterHackers recommends 245 °C throughout.((https://www.matterhackers.com/store/l/petg-black-high-strength-filament-1.75mm/sk/M3MY2VQG))
+===== Print speed =====
+PETG is very sensitive to print speed.((https://www.wevolver.com/article/tips-to-improve-petg-bed-adhesion)) Print too fast, and you’ll have poor layer adhesion, extruder skipping, and low print quality, but print too slow, and you’ll end up with deformed parts, stringing, and oozing.
+In general, the material is best printed at a slow speed, ideally around 60 mm/s. This leads to improved bonding and cooling, and consequently better print quality. //Some users report good results with faster speeds for the first layers.//
+To correct the print speed setting, increase the print speed value by increments of 5-10 millimeters/second until you push it to the highest value where you don’t experience any problems.
+===== Coasting =====
+When enabled, the coasting feature replaces the last few millimeters of extrusion with a travel move where the printer stops extruding.
+You can configure the coasting volume by increments of 0.01 cubic millimeters until you get the desired results.
+===== Wiping =====
+When enabled, the wiping feature causes the nozzle to move over the outer layer of the model to wipe any remaining filament off.
+Wiping feature also has a parameter you can adjust, called wipe distance. You can configure this value by increments of 0.01 millimeters until you get the desired results.
+===== Combing =====
+Combing --> Travel Path Adjustment
+You can find a feature called combing in some slicers and enabling it causes the travel paths to be re-calculated in a way where the extruder always stays over the print, even if it means that the travel distances will be greater.
+Keeping the travel paths on the boundaries of the print reduces the need for retraction and can help prevent the filament from stringing.
+===== Z-Hop =====
+Vertical lift (z-hop) is a feature that causes the nozzle to move up by a slight margin after a retraction.
+When enabled, this feature can help prevent PETG from blobbing as the extruder won’t be able to leave leftover filament on the print due to the distance created.
+There are a lot of mixed opinions about this setting in the 3D printing community, as some people have reported that it actually made the stringing and the blobbing issues even worse.
+Experimenting with this feature if nothing else has solved your problems with PETG blobs or PETG stringing.