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I'd like to print the top layer of my EAGLE PCB so I can check wether all the components fit as they should. Obviously, the dimensions should be the same as if manufactured. What is the best way to do this?

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    \$\begingroup\$ See any toner-transfer PCB tutorial, as even if that is not your goal, the process is basically the same. \$\endgroup\$ – Chris Stratton Aug 3 '18 at 1:55
  • \$\begingroup\$ depending on your software you may have to adjust the zoom until it comes out the right size. \$\endgroup\$ – Jasen Aug 3 '18 at 3:28
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You can check the answers on this related question: Related question

Pretty much boils down to this: You can print the board design directly or as pdf. However a lot of printers, pdf renderers automatically scale the image or fit it to the page. Make sure you have the right "scale factor" or the "actual size" options enabled and you should be good to go.

EDIT:

If you have your board layout go to the upper left corner, and press the button with several coloured squares on it. Board layout

After this you deselect all except for the top layer, or any layer you want to be seen on the print Layer select

if you then go to file > print only the top layer (or the layers you wanted) should be visible and you can print Printing

EDIT #2: Ground fills

If you want to remove a ground fill, after using ratsnest. you can use the rip up tool. If you select the ripup tool and click on the dotted outline of the layer the filled polygon is on the fill will revert to just its dotted outlines. if you ratsnest afterwards the fill will return.

Ripup

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  • \$\begingroup\$ Ok, but how do I actually go about doing this? \$\endgroup\$ – 19172281 Aug 3 '18 at 10:41
  • \$\begingroup\$ The related question doesn't give instructions on only printing the top layer. \$\endgroup\$ – 19172281 Aug 3 '18 at 10:42
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    \$\begingroup\$ @B4039 I edited the post to show how to select and print just the top layer \$\endgroup\$ – Remco Vink Aug 3 '18 at 12:03
  • \$\begingroup\$ Thanks. Is there any way to remove the ground pours, so I don't use up too much ink? \$\endgroup\$ – 19172281 Aug 3 '18 at 12:51
  • \$\begingroup\$ Edited to show how to remove ground pours. \$\endgroup\$ – Remco Vink Aug 3 '18 at 13:20
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You´ll have to export it to a pdf file, just like almost(if not all) all pcb design softwares have available. If you´re using corrosion and heating processes and want the top layer to be printed then you have to export the pdf with the mirror box checked, otherwise you´ll end up messing up the whole circuit.

Done that, you have to print the traces, top and board edge using a glossy paper so you can later apply heat.

Tighten the glossy paper with some tapes on the board you have.

Now you´ll have to apply heat straight on it, which if it´s a homemade project you should propably use an iron, given the fact I think you don´t owe any industrial press at home. It´s done so the ink may leave the glossy paper and stick to your board.

Finally you will only need to apply corrosion for about 20-30 min depending on acid concentration. Then you take your pcb, wash it and wipe off the remaining ink, which will give places to your traces at last.

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    \$\begingroup\$ I think you missed the point. The question was concerned with making a true sized printout on paper to check the size and position of the parts before having the board manufactured. It wasn't about making the board at home using the toner transfer method. \$\endgroup\$ – JRE Aug 3 '18 at 5:36

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