This is my 3D printed version of the popular PCBite clamp. It is used for holding FR4 PCB during prototyping and repair.

Print at least four of these so that all four corners are properly held ;)

I bought the compression springs from Amazon:

https://www.amazon.co.uk/sourcing-map-Compression-Stainless-Compressed/dp/B08VDK2SDX/ref=sr_1_4?crid=1WSBP59AEWQSE&dib=eyJ2IjoiMSJ9.ajW0TSxSREXdSZswyzJvY0xPxFe09mlQm9B_ae7yKHXgvDF9Nny9uwGrfvFLjdkzl76FqtRSPdUynGxqQFPYb3q-v0usRHCVI7aKCM1gZIvtcTPgMmFXiZqPlbpXTuJkDBGqnKQ13q8-w72leKAM7KEm5Ovg1C-4bIIOVAeLQnhSHyitCs6d-4CpuwM6Kp1GUZl4vYxi0Vp-wkZXgXJUQ5ndz0tI3qKS5GHKv0Ggk88f1ic_x_Rg_FPIynKVyKZN4pucm0dc7zzCUNNMXLy-0zc5-Sik_clKiFaW0u1r8YA.7EvIjQoQOki1fIxWV49x3ktrK_XryCI7yQVFXeJYLFE&dib_tag=se&keywords=sourcing%2Bmap%2BCompression%2BSpring%2C304%2BStainless%2BSteel%2C11mm%2BOD%2C0.8mm%2BWire%2BSize%2C%2B12mm%2BCompressed%2BLength%2C20mm%2BFree%2BLength%2C11N%2BLoad%2BCapacity%2Bfor%2BHome%2BProjects%2C%2BSilver%2BTone%2C%2B10pcs&qid=1749141330&refinements=p_85%3A20930949031&rnid=20930948031&rps=1&s=industrial&sprefix=sourcing%2Bmap%2Bcompression%2Bspring%2B304%2Bstainless%2Bsteel%2B11mm%2Bod%2B0.8mm%2Bwire%2Bsize%2B12mm%2Bcompressed%2Blength%2B20mm%2Bfree%2Blength%2B11n%2Bload%2Bcapacity%2Bfor%2Bhome%2Bprojects%2Bsilver%2Btone%2B10pcs%2Cindustrial%2C105&sr=1-4&th=1

I also bought the self tapping M3 screw from Amazon:

https://www.amazon.co.uk/sourcingmap%C2%AE-50pcs-Stainless-Tapping-Screws/dp/B01LXRNJ1Y/ref=pd_ci_mcx_mh_mcx_views_0_title?pd_rd_w=Dl4Gy&content-id=amzn1.sym.d63274d0-bf52-45e7-ae69-2bcf85c5865c%3Aamzn1.symc.ca948091-a64d-450e-86d7-c161ca33337b&pf_rd_p=d63274d0-bf52-45e7-ae69-2bcf85c5865c&pf_rd_r=WQZ402B6X3DM6C9933C3&pd_rd_wg=WpJmU&pd_rd_r=1cd69d90-e3b4-43a9-aba2-64bedc0b729e&pd_rd_i=B01LXRNJ1Y