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RepRapPro Mendel

Started by Bad Raven, March 29, 2018, 07:27:56 pm

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Bad Raven

March 29, 2018, 07:27:56 pm Last Edit: March 29, 2018, 07:33:38 pm by Bad Raven
School has a "new" 3D printer I have never seen as a Teacher has it "locked away" and not even any of the other teachers get a look in (seen nothing come from it yet either..............   :whistling:). I'm also told they have ordered another. No idea what.

OK, to point. Apparently "some time ago" they bought a printer which no-one got working reliably. It sits looking forlorn on a shelf in the DT Tech's workshop gathering dust.

Working from a look over and then that evening internet trawl, it's a RepRapPro Mendel.  4 miles of studding, hundreds of nuts, more stepping motors than you can shake a stick at, and a bed that to me looks far too flexible.  A glass plate has been added.



I'm told that when it actually stays focussed (!) it produces a good print, but it has a tendency to stop printing terminally with line after line of code flying nowhere.  If they were printing from PC as I suspect the school IT have an awful reputation for producing machinery that James Watt or Richard Trevithick would have surpassed on speed and reliability with ease, so even a better source must help!

It seems a waste not to get it sorted, or is it a hopeless case?  The main cct card sits fully exposed to one side and there are wires everywhere inc to a none too professional looking PSU, so a serious tidy up and shielding might help?  Maybe a more stable PSU if its one now has proven as iffy as it looks?   As might other/newer firmware? (I have no idea what it has now).

Any useful comments?  Do I bother or just leave it sat on the shelf, no teacher is ever going to bother with it.
HobbyKing Fabrikator II Mini, 100x100x100. (a Malyan printer re-badged) - Modded with magnetic Flex Bed

Original Prusa i3 Mk3 (All Black)

shawdreamer

strip it, repurpose the parts in a more reliable frame, should be fine.

Ive never been a fan of using studding as the main material for a frames build (its proper old school reprap), the main reason being that it can have way to much variance on each stud length meaning that when its all tied together during the build immense care has to be taken to accurately set, check and then check again each an every dimension of the frame to make sure there's no twist or distortion, any missed distortion will show up the instant you start printing in the form of anything from off level horizontals, non 90 degree right angles.... the list is endless and can often mean stripping the frame down again and rebuilding.

everythings there visually to make something along the lines of a i3 style for minimal cost which would certainly give you something a lot more predictable and reliable print wise.
Geeetech Prusa i3 pro-B (ABS Workhorse)
Pultur Prusa (my own design)
Poltur XL (my own "MUST BE BIGGER" design)
Poltur XL v.2 (my own "MUST BE BIGGER STILL, MUST USE EXTRUSION" design)
https://www.thingiverse.com/shawdreamer/designs


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