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| PeterE builds a 3d Printer |
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| nrml:
Mine mounts perpendicular to the X slide so I am afraid I can't give you any first hand information on the thickness needed. Have you had a little search on thingiverse or equivalents for a suitable piece? |
| picclock:
Hi PeterE Just some info which may be useful for setup of the Y axis drive belt. I have just done a series of calculations to determine the change of belt length caused by poor height alignment of the driving, idler and bed mounting. Basically, if there are height differences as the bed gets closer to the end it it will stretch the belt to accommodate the difference in length, and the closer to the end the larger the error is. For a 1mm height difference I calculated 0.236mm belt stretch at a distance of 2cm. Two fixes spring to mind. Easiest is to make very sure that the heights are all the same so there is no angular deflection of the belt, or a slightly more bodgy method is to ensure that the bed mount and idler/driver are always a fair distance from the end position. At 5cms the stretch falls to .1mm and halves linearly from then on. Hopefully this will prove of some use in your setup. Best Regards picclock |
| PeterE:
@nrml; Thanks for the info. It is actually useful as it does not say no to my guess :dremel: Another thing, why not show a picture of your setup? It would be interesting for me at least! @picclock; Thanks for that info. Good to know. When I get my idler from China (20 tooth GT2 flanged idler with bearings) I will fit the belt for the Y movement and as it is not yet fixed to the base it will be easy to take a picture to show if it deflects or not. /Peter |
| nrml:
I managed to get a couple of pictures of the extruder to make it a bit clearer. Sorry about the poor quality. The printer has ended up in the storeroom which is a bit of a dump at the moment and the lighting is not very good there. It got the marching orders from my wife after occupying the dining table for over a month. I'll drag it out and get better pictures later. |
| PeterE:
@nrml; Ahh interesting indeed. Your Wades extruder design is different from mine! Your version seem to nip the extruder nozzle with heater using a clamp in the base, whereas mine does not have that at all. See image below. (Snip from picture on John Riddley's site as my camera isused by my daughter on vacation). As far as I understand, my design requires a metal (aluminium) plate with a slot catching the extruder nozzle and heater, and will co-act as cooling fin to save the extruder feed parts. Have you experienced any problems with heat from using ABS (which I understand requires a bit high temp than PLA f ex)? /Peter |
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