Sigma 10-20mm D DC HSM Lens Hood

prusaprinters

<p>After reading an entry on the PrusaPrinters blog about photography, I realized that I can solve a problem I had for a long time. I have had a Sigma 10-20mm lens for many years, but broke my lens hood a long time ago. I could not find a replacement that worked. The best one I found would show up on the corner of the images if I was at 10mm-11mm. I was always a bit aggravated.</p> <p>I have no idea why I never designed and printed one. I guess I needed that blog to bring my two worlds together.</p> <p>So while this may not be a very popular print, I put it up here anyway, just incase there is someone out there that had the same issue I had.</p> <p>This is designed with VERY tight tolerances, so please read my instructions on different materials! I have printed this in several different materials so I could test and provide some starting points for you.</p> <p>I have noticed from some other prints I posted here that many individuals do not read everything and this lead to some issues. I could redesign this so it works OK with all materials if you just print it, but I want something perfect. If you got this far, then it's a good sign!</p> <p>The first image is a render in Cinema4D with the Arnold renderer, the second image is a render in Fusion360, and the last photo is an actual print done in 3DXtech Carbon Fiber ABS.</p> <h3>Print instructions</h3><p>This has been designed to print in PETG. I like PETG because it can handle heat better than PLA, and is slightly flexible which allowed me to make it a tighter fit. The issue with PETG is how shinny it is which can cause reflection on the glass.</p> <p>Another good option is carbon fiber ABS. The carbon fiber "dulls" the print and of course ABS can handle the heat well. A lens this wide is for outdoor use. If for some reason you took a photo of someone with this lens, they will run for cover if they ever saw you with a camera again! So I have to assume that you primarily use this lens outdoors for landscape photography. Therefore it must be able to withstand high heat.</p> <p>I also printed this in Proto Pasta Carbon Fiber HTPLA. Wow, this made for a spectacular looking print! I then heat treated this in an oven which made it similar to ABS in its ability to handle heat properly.</p> <p>Therefore, please follow these <i>suggestions</i> for a successful print:</p> <p><b>PETG</b> - print as is. (I have not tried CF-PETG and the size may need to be increased slightly since it will loose some flexibility.</p> <p><b>CF-ABS</b> - increase the X and Y to print at 100.6%</p> <p><b>Proto Pasta CFHTPLA</b> - Increase the X and Y to 100.9% if heat treating. (While it worked fine at 100.9%, it was a little tight. You may want to experiment with scaling this larger at 101% to 101.5%)</p> <p><b>ABS</b> - Increase the X and Y to 102.%. (Please noticed I wrote <b><i><u>102%</u></i></b> and NOT <b><i><u>100.2%</u></i></b>!)</p> <p><b>PLA</b> - Uhm, no. If you REALLY must use PLA, then print this scaled up to around 100.7%. However, PLA is not recommended because it will warp when outside in the summer heat! Also keep in mind that PLA is one of the more stiffer plastics and will not "give" while trying to lock the lens hood in place. So you may need to go larger than 100.7%.</p> <p>Please let me know if you found better results with any other changes. Good luck.</p>