This tool enables you to insert a standard Sharpie marker and trace the contours of objects onto fabric at exactly 1/2" seam allowance.

Sewing Tool - Half Inch Seam Allowance Sharpie Marker Tracing Tool

halfinchseamallowance.stl

My laser had a warped carriage that caused it ride wavy down the rail. It was enough to show up in the prints so I purchased this [MGN12 (400mm/15.75") Linear Rail](https://www.amazon.com/Linear-MGN12H-Carriage-Printer-Machine/dp/B08JYC83YL/ref=sr_1_1_sspa?crid=2HGUMOXQCLRTJ&keywords=MGN12%2B400mm&qid=1682562389&s=industrial&sprefix=mgn12%2B400mm%2Cindustrial%2C113&sr=1-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVDFJNllPU01CNTNEJmVuY3J5cHRlZElkPUEwNjkwMTY4MlVMWE44VjdYTzZXWSZlbmNyeXB0ZWRBZElkPUEwNTE4NDM0MzM5R1JKNTZTNE1JRyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1) and designed an adapter to hold the mirror/lens. Now it slides perfectly along the X-Axis. 

I set the rail on top of the existing rail, drilled a couple of holes, and through-bolted it with nuts. 

K40 Laser Adapter for MGN12 Linear Rail

My laser had a warped carriage that caused it ride wavy down the rail. It was enough to show up in the prints so I purchased this MGN12 (400mm/15.75") Linear Rail [https://www.amazon.com/gp/product/B08JYC83YL/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1](url) and designed an adapter to hold the mirror/lens. Now it slides perfectly along the X-Axis. 

I set the rail on top of the existing rail, drilled a couple of holes, and through-bolted it with nuts. 

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Sewing Tool - Half Inch Seam Allowance Sharpie Marker Tracing Tool

K40 Laser Adapter for MGN12 Linear Rail