This topic contains 2 replies, has 3 voices, and was last updated by Mark Newton 1 day, 10 hours ago.
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I have purchased the PETG smart reel from CEL here: http://www.cel-global.com/robox_shop/index.php?route=product/product&path=60_64&product_id=140
I have been having trouble with the bowden tubes getting clogged, and initially thought it was a moisture issue, but after fighting the material out of the tube, it appears the material has somehow very slightly melted and taken the shape of the tube for about 2 inches just before the inlet to the print head. The entire length of filament from the extruder to the head has the indents from the extruder pushing it along, but the 2 inches before the print head is smooth and was stuck in the tube. I havent altered the print settings on the smart reel so I am wondering if the ambient in the chamber is too high (I have increased it to get our ABS prints to stop warping) or if there is any special accommodation that is usually made for the PETG.
Ive had that happen with PLA because the ambient was set to 40°C and that plus the thermal conduction from the heater element all the way back along the feed path to the xcarriage caused the PLA to soften and jam in the Bowden tube.
Suprising that its happening with PETG, given its glass transition temp is a good 20 to 25 °C higher than PLA (circa 80°C). Mind you Ive never used CEL PETG always used Formutura, Colorfabb or Rigid Ink stuff.
So yes as I test I would set your ambient to 30°C rather than what it is for ABS and give it another go. if not then maybe your head fan is failing? what head is it?
Aerospace Engineer with a creative itch being scratched by Robox!
This is interesting because I am getting this happening with one roll of filament PLA white. Ambient is set to 30 deg.
Could the filament get damaged in some way that causes this? Perhaps moisture? It is one on my older filaments.
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