Apologizes. Went back and looked at the PDF I captured from the calculator and there it is under the title Material Dimensions.
All I can say is I looked several times and missed it each time.
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Don’t beat yourself up about it - of all of the mistakes you could make, this is about the cheapest and easiest to fix. Just buy a roll on Amazon and forget about it. With the complexity of the software tool flow, feed and speed decisions and calibration, you’ll have many more intractable and expensive opportunities to screw up in the future. Order a large trash can at the same time as you order the new belt. It’s going to happen - the trick is to push through to the next one, and the next and the next…, and try not to repeat the same screw up. Eventually the world runs out of new ways to torture you, and you get something useful out of the tool.
Hey all good, no beating oneself up. Ordered an extra meter of belt from Ryan originally so I would have a spare. So now I only have a spare for the short side 
Maybe a tip box in the instructions could help others.
I find I “measure twice, cut once and regret it instantly” way too often, so any time I can figure out a “self measuring” mechanism rather than use a ruler, I take that option. My tip would be to fit the belt in one holder, then in the other and cut off the excess. No need to measure anything.
On the topic of screw-ups…
I made these shelves using the Burley. But the pieces were too big so I decided to slide them through the machine a couple of feet at a time. My shop is too small so I did it outside on our picnic table. When the job was over, I tossed a tarp over the machine and left it outside while I worked on another project inside. The Burley melted under the tarp in the sun. Hence the move to the Primo.
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Those shelves are cool. What are they made out of?
Just MDF.
Designed using the Voronoi generator plug in for Fusion 360, cut from 3/4 MDF using a1/4" Amana Tool single flute carbide bit on the Burley mounted with a DeWalt 660, roundover-routed using a hand router 3/8 roundover bit. Edges sealed with Zinser shelac based primer, hand sanded then painted with satin nickel Rustoleum spray cans. Assembed using biscuit joints and TiteBond3. Shelves are CrystalClear 3/16 glass.
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Wow!, Just wow! And here I am struggling over letters for a “No Dogs” sign.
Excuse me whilst I go outside and cry by myself 
Rob
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Just double checked the calculator with the 23.5mm version. I get between 7-10mm more work area X&Y using the same calc numbers as the 25.4mm. Z is the same.
I vote we leave the calc alone for simplicity?
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1" is the way to go.
Those shelves are very cool!
Since the numbers are conservative and provide a little extra working space on “C” builds, I’d agree, keep the calculator simple.
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How about just a footnote so that people don’t need to oversized if they are space limited?
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Cool.
I think that would be nice, but there are also more pressing things to document. I would hate for someone to misinterpret a quickly created footnote, and then build it an inch too small…
If someone wants to tackle that footnote, and make a PR, we will review and merge it, probably.
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The imperial calculator already rounds/truncates by almost as much, so if we’re going for precision I’d vote for accuracy on imperial (rounded to the nearest 1/32nd of an inch, naturally 
) before we customize for “C” vs. “J”.
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Using the calculator, I wound up with 21 1/2 X 23 usable on 24 X 24 calculations. This is with a Bauer router. So I’m waiting on the conduit Primo plans, then I’ll upgrade to 36 X 24 usable area. I think that the calculator should have a setting for at least the DeWalt 660, so that the user will know what their final cutting area will be. My trust in the calculator has been shaken, so when I go to Primo, I’ll start with the whole center/Z section, and hand measure from there.
Burly?
Already out.
That is really big.
It will not be the same as any other router so you can not assume the Bauer is even close. More goes into it other than diameter.
If you choose not to use one of the recommended routers, when you design the mount you will need to mock up the entire build, determine your actual offset and post it with your mount files so others know. Look at my mounts as an example. After that you can cut your tubes to actual final length.
Wow! Thanks so much for the detailed reply!
Yes, it’s a Burly design.
I should have said 3/4" EMT Plans.
What is a conservative maximum area for the Primo?
My choice of router was determined by the previous owner of my Burly parts, he recommended it, and I’m happy with it, so far. It’s similar to a Makita RT0701C. In hindsight, I should have mocked it all up ahead of time before I cut my conduit (and made my wonderful custom table), but I had the bit between my teeth to get me a CNC, so such deliberation was thrown out the window.
Where are these mount files? Never found them.
They’re in the “Parts List page”. I missed them the first time, too!
Mounts
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