Well,
I haven't worked up a BOM for the Prism 1.5 as of yet. I really need to get on that. And I need to build a 400mm version to finish where I left on in the build instructions. So much to do...so little time.
For a machine using 500mm extrusions the smooth rod lengths are as follows:
X-axis: 605mm (you can get away with 600mm)
Y-axis: 540mm
Z-axis: 480mm
The 608 bearings remain the same as they are for the X and Y axis belts - the supporting M8 hardware remains.
The biggest choice you have to make is whether to use LMxUU bearings or sintered bronze ones. Personally I prefer the sintered bronze bushings. I have a new version of the X-ends that are highly configurable. They can accept either style of bearing, and can also be spec'd out for any size leadscrew. I don't yet have a version that accepts delrin nuts - they are fairly expensive. Currently I'm running with 1/4" ACME leadscrews using the standard 2 nuts and a spring per axis to remove any backlash.
But I think the biggest thing at this point is that for this size machine you *must* use 10mm smooth rods on all the axes, even the Z. The X and the Y are necessary for the spans involved. The over sized Z helps reduce/eliminate Z-wobble.
May 500mm extrusion machine:
Any questions don't hesitate to ask.
But a basic BOM:
(10) HFS5-2020-xxx extrusions
(100) HNTA5-4
(100) M4x14
(100) M4 Flat washers
(100) M4 lock washers
(~40) M3x20
(~25) M3x10
(~25)M3 Nuts
(~25) M3 Washers
(5) M10x1m smooth rods
(5) stepper motors
(2) pulleys, preferably GT2-36 and accompanying belts (2@1200mm)
(12) bearings (LM10UU/
10mm press bearings/some combination of the two)
(2) leadscrews, 400mm each
(4) nuts for leadscrews
(2) springs to fit leadscrews
But this BOM doesn't include the Y-axis single-point attachment component or the X-carriage or the extruder.
I'll get a full BOM worked up this weekend.
- akhlut
Just remember - Iterate, Iterate, Iterate!
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