<p>I'm at a location where I don't have easy access to toothed belts for my printer (a <a href="https://reprap.org/wiki/Wallace" rel="nofollow noreferrer">RepRap Wallace</a>). While trying to look for some solution, I saw some talk of using fishing line as a belt, along with a log of admonitions of <code>Don't</code>.</p>

<p>However, as I have easy access to fishing line, but almost no access to a toothed belt, I was thinking of using multiple strands of fishing line with regularly spaced knots to simulate a toothed belt. However, Google didn't help much with either usage or possible Gotchas.</p>

<p>Is there any possible issues that I may face with this solution?</p>

I’m going to recommend not using a fishing line with knots.  Probably the biggest problem you’ll have using the fishing line with knots is if the knots are not perfectly spaced,  movement along the X or Y axis is not going to be consistent. This could result in weird deformations in your print.
Depending on how you tie the knots they may not grip the teeth of the gears quite well enough to prevent slippage.
Both of these issues will mean that you will not get very good quality prints assuming the print doesn’t outright fail.
You would be better off waiting to get the correct belt then attempting to use fishing line.