Reddit reviews Two (2) 8mm x 406mm (.315" x 16") Case Hardened Chrome Linear Motion Rods/Shafts/Guides - Metric G6 Tolerance
We found 3 Reddit comments about Two (2) 8mm x 406mm (.315" x 16") Case Hardened Chrome Linear Motion Rods/Shafts/Guides - Metric G6 Tolerance. Here are the top ones, ranked by their Reddit score.
Round steel shaft for use with linear support blocks and closed type slide units in linear motion applicationsChrome plated for corrosion resistanceCase hardened for wear resistancePrecision ground grade 6 for consistent ball bushing radial clearanceShaft diameter and length specified for accurate fit
You could always just buy these and also get a saw. Alternatively, use this page, select the approximate size of your rod (in this case 8mm/251-498.5mm) and then enter the exact length you need in the "customize" section before adding it to your cart.
I think one of these should work. The thingiverse mentiones 45cm long, which is roughly 17 inches, so I think a 16inch or 19inch should be fine without cutting.
https://www.amazon.com/Hardened-Chrome-Linear-Motion-Shafts/dp/B01LXAZFKZ/ref=sr_1_3?keywords=8mm+rod&qid=1566315274&s=gateway&sr=8-3
https://www.amazon.com/ReliaBot-Hardened-Chrome-Plated-Linear/dp/B07DPFH7HL/ref=sr_1_5?keywords=8mm+rod&qid=1566315497&s=gateway&sr=8-5
Can't confirm these are the ones I got but they look like something Id buy, i just look for case hardened. If you dont have long lm8luus check those out too. And white lithium grease lube
https://www.amazon.com/Hardened-Chrome-Linear-Motion-Shafts/dp/B01LXAZFKZ/ref=mp_s_a_1_3?ie=UTF8&qid=1525048454&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=8mm+linear+shaft