18mm round steel stock bar saw helper
cults3d
got some problems sawing straight parts from your 18mm round steel stock. then this may help you a bit out. just use 2 M4 bolts that are 16mm long. and you could thread it in the plastic, but you might as well clamp down with 2 M4 nuts. besides sawing straight could also help to have a clear view on your measurement.
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