📝 (docs): Add iron-on guide for TPU print
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IRON-ON-GUIDE.md
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+# Ironing the TPU Print onto a T-Shirt
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+Instead of printing directly onto fabric (see [README](README.md)), you can print the logo flat on the build plate and iron it onto a cotton t-shirt afterwards. TPU melts and bonds nicely into the fabric weave under heat and pressure.
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+## What you need
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+- The printed TPU logo (flat, 0.4 mm)
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+- A cotton t-shirt
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+- A clothes iron
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+- Baking paper (parchment paper)
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+## Steps
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+1. **Set the iron to level 3 (•••, cotton setting).** Let it fully heat up.
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+2. **Position the print** on the t-shirt where you want the logo.
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+3. **Cut a piece of baking paper** slightly larger than the print and lay it on top. It protects the TPU from direct contact with the iron and keeps it from sticking to the soleplate.
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+4. **Press down firmly for about 30 seconds** with the iron flat on the baking paper. Use real pressure — this is what pushes the softened TPU into the fabric.
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+5. **Work the edge of the iron over the print with force.** Slide the soleplate edge across the whole logo.
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+6. **Rotate the iron 90° and repeat** the edge pass in the other direction.
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+7. **Repeat steps 4–8 several times** until the print is bonded to the shirt and no longer lifts at the edges.
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+8. **Let it cool briefly**, then turn the shirt inside out (print facing down).
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+9. **Iron the back side** over the logo area a few more times to finish the bond from behind.
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+## Tips
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+- Cotton only — synthetic fabrics can melt at the cotton iron setting.
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+- Peel the baking paper off slowly after cooling; if the TPU sticks to it, iron again.
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+- Gently tug the edges of the logo after cooling to check the bond — if a corner lifts, repeat the pressing.
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+- Wash the shirt inside out at low temperature to make the print last longer.
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README.md
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- No infill settings matter at this height; the whole part is top/bottom layers.
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Of course you can also just print it flat as a sticker, badge or keychain blank.
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+Alternatively, print it flat and iron it on afterwards — see the [iron-on guide](IRON-ON-GUIDE.md).