PrintMonkey

Has anyone done this mod recently, to share more details? Having two heads that retract is essential. There's no information on how the retraction part worked - its a shame SuperDave isn't active still. My aim would be to mod UM2+ to UM3 as per SuperDave and have one head extruded by direct drive - a modded version of the awesome Flex3Drive https://flex3drive.com/product/g5-flex-extruder/. This would allow 60A flex materials to be printed very fast with PLA supports - something event the Ultimaker S5 struggles with. With a small redesign it should also be possible to have a single Flex3drive direct drive move between extruding each head, as only one head prints at a time. Any one interested in teaming together to support and develop this?

Oil is essential to successfully print with the 0.25mm nozzle. There is a smell from the oil heating but it is the only way to print with 0.25mm I've found. I'm next going to select a plastic rubber down to Sure A 70 using oil and teflon tube.

Thank you gr5 I will buy one of those.

Should anyone wish to use BASF Forward AM - Ultrafuse TPE 60D, I've found a solution on UM2+. Please see this link:

Success! I found friction in the feeding tube (from extruder to hotend) was the biggest contributor to the problem. There were two prime issues causing excessive friction that slowed, then stop filament movement: Prime Causes: TPE 60D has a rubber to touch feel. This slips much less than most materials against the inside of the feeding tube. During print, repetitive retractions combine with issue a) that causes a nipping of the material by the extruder. This causes the filament to expand causing more friction inside the feeding tube. Based on: UM2+ 0.4mm Nozzle @230° bed @60° Speed 40mm/s 100% infill w/tree support - Cura5.3.0 Solution: Clean the extruder Clean the feeding tube Reduce the extruder pressure from mean setting for most materials Reduce printing speed by 50% from above Optional solution if problem persists: Reduce the feeding tube length (in so reducing printable area) Reduce printing speed by 70% from above Thank you all. I now aim to make further changes to print down at 0.25mm Nozzle which is out of materials spec.

Thank you that is very helpful advice. I am finding more often than not there is slip in filament delivery - likely from many retractions at the point in the model where retractions are more frequent. I suspect this is grinding the filament at a specific point so there is no grip. I will try reducing speed by 70% and increasing or reducing feeder grip pressure and report back. I am a little confused though because the softer PTU prints fine!

Thank you for the replies, especially libertyhouseplans. I changed material in the end to ABS to get the job done and never resolved the problem. I've recently come back to TPE 60D material from BASF and have the same problem on a completely different model. I'm still scratching my head! I had noticed an expansion of the filament itself that blocked the delivery tube by much friction which stopped the extrusion. However the last print stopped at the same place, and this was not the case. Nor was there any nozzle block. I wonder if anyone has successfully used this material - TPE 60D?

Hi, Do you have any ideas why my print is stopping at a particular point every time despite redawning and reorientating? Please see attached images that illustrate the model and where it stops in purple. The UM2+ says complete on the screen at the purple point. I'm using Ultimaker 2+, Cura 5.2.1 & Sketchup Pro. The model is using TPE 60D with 0.8 nozzle and Tree support in the well between the two flats. Thank you so much for any advice, I'm really scratching my head on this one. I've also added the Gcode. Stops here Full model UM2_Spoon Rest.gcode

Anyone used and programmed material files for BASF Forward AM - Ultrafuse TPE 60D. Newish biodegradable rubber like material with near homogeneous layer bonding. Many thanks in advance.