I had some acrylic sheets from old Melissa and Doug toy boxes, and needed some arm protectors for archery for myself and the kids (I later used more of the acrylic for a bow sight).  A bit of work with hair dryer, box cutters and rotary tool, and I made some that work fairly well, though they are somewhat difficult to put on over clothes (Velcro might work better).

The arm protectors have two functions: one is to protect the arm from string slaps, and the other is to keep clothes out of the way of the string.  The smooth plastic also may mean that if the string goes on the protector, it won't distort the shot extremely (though it will distort it significantly).

These are usually made of leather, but I don't have any scrap leather.

Step 1: Cutting Acrylic

Cut acrylic sheet to the length you want, and wide enough to wrap as far around the arm as you want it to.  

You can cut acrylic sheet by scoring deeply (a couple of passes may be needed) with box cutters, and then breaking (while wearing safety goggles, of course).  Then you can smooth the corners and the edges with sandpaper, a file or (in my case) a sanding drum on a rotary tool or drill.  As always, when sanding plastic (and other things) wear breathing protection.
I dont mean to rain on your parade. But If you grip the bow correctly you will not need an arm guard. In the pic your arm is turn rotating inward. The correct way to hold a bow is to have your elbow rotating clockwise outward (right handed) and bend the elbow slightly to avoid any contact with bowstring. <br>The riser handle is gripped not at the palm but at the junction of thumb pad and fore finger. <br>Doing this you will feel like the bow will &quot;jump&quot; out of your hand this only is achieved by proper hand grip, to keep the bow from &quot;jumping&quot; out of your hands a bow sling can be used <br>Your arm guard can be used though to keep camo clothing from touching your string on release.
I agree that the string shouldn't hit the arm if things are done right. But a beginner like me is unlikely to do things right every time. :-)<br><br>I do keep the bow as described, with some other fingers loosely circling the grip to perform the sling function.<br><br>If the elbow is slightly bent, won't that lead to a draw-length inconsistency, unless of course a clicker or other draw check is used, since it's hard to bend at the same angle each time?
Draw inconsistency comes from lack of practice. A properly sized bow will draw and set and the end of the draw. Mine is at 29.5&quot; I pull the bow back and feel the string hit the &quot;valley&quot; and I pull ever so slightly to the end where the string begins to tighten again, That is where I get my consistent draws. <br>
Valley? On my recurve, there is just smooth continuous pullback, with ever increasing tension. Are you shooting a compound?
Yes but that comes with time and practice. My suggestion is to straighten the arm for full extension but remember to rotate the arm like I described. This will eleviate the nasty string slap. Please watch some archery vids (youtube) this should help.
I also expect that a big arm protector like this gives some protection, though a Protx glove will also be needed for more protection, against shards of exploding carbon arrows.
WHy would am arrow explode? It will only explode when it hits something like a cement wall then it would splinter.. Im not sure what type of arrows you use, but mine will not explode.
If you google, there are gruesome pictures of carbon arrows that break up on firing, with pieces sticking through people's hands.
What type of bow are you using?
Samick Polaris 66&quot; recurve, 26# at 28&quot;.

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