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Evaluating Craftbot 3 Design

Posted by ChayDuuLetDuu 
Evaluating Craftbot 3 Design
April 05, 2019 03:25AM
Looking to build a niche machine for printing orthopedic devices (mostly prosthetic sockets) and looking into motion systems.

What do you all think about the new Craftbot 3 gantry system?



It is almost like a Cartesian & H-bot hybrid, so shorter belts, no stacked or crossed belts, and a mechanically (albeit not so much w/ firmware) simple IDEX implementation w/ no moving motors (other than extruders). Seems like it would be easy to keep the non-extruding motors out of the heat zone for a heated build area if necessary as well.

Leaning going this direction (probably with only 1 Y motor like FFCP/Replicator) and willing to fight the firmware battles to end up with a more straightforward alternative to the CoreXYU or heavier cartesian IDEX in the long run.

Edited 1 time(s). Last edit at 04/05/2019 03:27AM by ChayDuuLetDuu.
Re: Evaluating Craftbot 3 Design
April 06, 2019 12:38AM
That was just looked like H-bot.The X-axis should use dual X motors for longer belt to reduced tilt.

Edited 1 time(s). Last edit at 04/06/2019 12:46AM by datesheet.
Re: Evaluating Craftbot 3 Design
April 06, 2019 03:30AM
Quote
ChayDuuLetDuu
What do you all think about the new Craftbot 3 gantry system?

It is almost like a Cartesian & H-bot hybrid, so shorter belts, no stacked or crossed belts, and a mechanically (albeit not so much w/ firmware) simple IDEX implementation w/ no moving motors (other than extruders). Seems like it would be easy to keep the non-extruding motors out of the heat zone for a heated build area if necessary as well.

Leaning going this direction (probably with only 1 Y motor like FFCP/Replicator) and willing to fight the firmware battles to end up with a more straightforward alternative to the CoreXYU or heavier cartesian IDEX in the long run.

RepRapFirmware will support that configuration without you even needing to recompile it. The standard binaries support any kinematics in which the motion of each axis is a linear combination of motor movements (as well as several nonlinear kinematics). You specify the motion coefficients in a command in the config.g file on the SD card.

The extruder motors in that picture look unnecessarily heavy, even if using a Bondtech or similar extruder with only 3:1 gearing. With higher gearing you could use pancake motors or Nema 14 motors.



Large delta printer [miscsolutions.wordpress.com], Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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